A Logitech RGB keyboard, backlit, full-sized and with a column of configurable macro keys.
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Pro Media keys
Like most large gaming keyboards and unlike smaller, general-purpose keyboards (Ducky, Leopold, Topre, etc.), the G910 has a full set of media keys (play/pause, stop, rewind, fast-forward, mute, and a volume roller).
Pro Arx Dock
Instead of the LCD screen that Logitech put into several previous keyboards, the G910 has a phone dock and iOS/Android app. This has several advantages over the embedded screen, mostly lower cost and the ability to control the screen on its own. Arx Control can monitor system temperatures and clocks and even launch games.
Pro Logitech Gaming Software
The G-keys and lighting have tons of configuration options in LGS. This is also a pro for users of Logitech G-Series mice and headsets, as you only need one software installation to work with all of them.
Pro RGB backlighting
Like the Blackwidow Chroma and K95/70/65 RGB keyboards, the G910 supports custom per-key RGB colors.
Pro LUA scripting
LGS has a LUA scripting engine in case its macro capabilities aren't enough. Unfortunately, scripts are wholly separate from macros, so you can't save scripts and then use the GUI to assign them to keys.
Pro Lots of macro keys
G1-G5 are easy to reach, G6-G9 less so. There are also M1, M2, and M3 profiles, which can hold a complete set of G-keys each. LGS can also configure this per-game, so players of multiple MMOs can have three sets of G-keys for each MMO rather than just three in total.
Pro Windows key locking
Most keyboards support this in one form or another, but the G910 has a nice big button next to the lock LEDs.
Pro Almost no LED bleeding
Because the Romer-G switches actually have LEDs inside them, which is impossible with switches like Cherry MX, Kailh or Topre, it's very difficult for any of the light to bleed out. It still happens a bit, but not much.
Con No custom keycaps
There are no custom keycaps for Romer-G switches. Also, since they have completely different stems from all other existing switches, keycaps made for other switches also can't be used.
Con Lighting modes are restrictive
Each key can be set individually, but if you want to create an animation, then it has to be across the whole keyboard. It's no possible, for example, to animate just the number pad.
Con Feet are rather short
The G910 is almost completely horizontal with the feet out, and it actually angles backward with them retracted. Longer legs would help a lot.
Con Wrist rest cannot be removed
The G910 has a wrist rest skeleton built onto it. It comes with two covers, one covers the skeleton and the other one extends it, but it cannot be removed.
Con Keycap font
The keycap font is one of those that can be referred to as a stereotypical "edgy gamer" font. Something more discreet, like Arial, would be much better.
Con Long key travel distance
The G910's Romer-G switches have a longer travel distance than most domes.
Con Takes up much space
The G910 is very large, even for a fullsize keyboard.